WhatsApp is now sending 50% more messages than SMS, but what happens next? How many messaging apps can co-exist? How far can the WeChat platform model spread? Can messaging become an aggregation layer?

Everything is wide open in mobile. So, here, in no special order, are 20 questions for 2015, any one of which would change things a lot. I've written about most of these topics already in 2014 - in 2015 they're even more interesting.

The UK media and telecoms regulator, Ofcom, produces an annual report surveying the global media and telecoms market. It's full of fascinating international comparisons - I've extracted some of the ones that caught my eye here.

We tend to assume that Google's mobile apps and services are very broad and very sticky, and that gives Google tremendous leverage in extending its ecosystem and retaining control of Android. But that's just an assumption - can we be sure?

The mobile platforms wars are over, for now - Apple and Google both won. But nothing is settled. The nature and scope of Android is unstable, interaction models themselves are in a flux between apps,web, messaging and notifications, wearables are emerging and Facebook and Amazon haven't given up on controlling the interface. Time for new questions.

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Podcast

Andreessen Horowitz does a regular podcast: episodes I was involved with are embedded here.